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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. See the documentation for help with subscribing to or submitting Circulars.

Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
Advanced Search

To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.

Advanced Search Examples (click to copy):

subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

19701 results found.

  1. GRB 131024A: Enhanced Swift-XRT position
  2. IPN triangulation of GRB 131011B (Swift Trigger 574266)
  3. GRB 131024A: Swift detection of a burst
  4. GRB 131014A: RATIR Optical/NIR Afterglow Retraction
  5. IPN Triangulation of GRB 131014A
  6. GRB 131018B: Swift/UVOT Upper Limits
  7. GRB 131018A: RATIR Optical and NIR Observations
  8. GRB 131018A: Swift/UVOT Upper Limits
  9. GRB 131018A: Enhanced Swift-XRT position
  10. GRB 131014A: XRT position information
  11. GRB131018A, optical observations
  12. GRB 131018A: Swift detection of a burst
  13. GRB 131014A: GROND observations
  14. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  15. GRB 131011A: Swift/UVOT Upper Limits
  16. GRB 131014A: Swift/UVOT Upper Limits
  17. GRB 131014A: RATIR Optical and NIR Observations
  18. GRB 131014A: Enhanced XRT position
  19. GRB 131014A: NOT afterglow candidate
  20. GRB 131014A: Nanshan optical observations
  21. GRB 131014A: Fermi-LAT detection
  22. GRB 131011A: GROND afterglow observations
  23. Fermi403206457: continued P60 observations and fading behavior
  24. Fermi403206457: Weihai optical upper limit
  25. Trigger 574266 is not a Swift detection of a known source
  26. GRB 130831A: Continued RATIR Optical and NIR Observations
  27. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  28. GRB 131004A: Swift/UVOT Detection
  29. GRB 131004A: RATIR Optical and NIR Upper Limits
  30. GRB 131004A: GROND observations of the afterglow
  31. GRB 131004A: Enhanced Swift-XRT position
  32. GRB 131004A: Liverpool Telescope optical afterglow observations
  33. GRB 131004A: TNG optical afterglow confirmation
  34. GRB 131004A: optical afterglow from the NOT
  35. GRB 131004A: Swift detection of a burst (may be short)
  36. GRB 131002B: GROND upper limits
  37. GRB 131002B: Swift/UVOT Upper Limits
  38. GRB 131002A: Swift/UVOT Detection
  39. GRB 131002B: Enhanced Swift-XRT position
  40. Swift J1242.9-3530, Swift-BAT refined analysis
  41. GRB 131001A: Swift UVOT and XRT Upper Limits
  42. GRB 131002A: Enhanced Swift-XRT position
  43. GRB 131002B: Swift detection of a burst
  44. GRB 131002A: Swift detection of a burst
  45. Swift Operations in the event of a US Government shutdown
  46. GRB 130929A: Swift/UVOT Upper Limits
  47. GRB 130831A: Continued RATIR Optical and NIR Observations
  48. GRB 130929A: Enhanced Swift-XRT position
  49. GRB 130929A: TAROT La Silla observatory optical observations
  50. GRB 130929A: Swift detection of a burst
  51. Fermi LAT Upper Limits on GRB 130925A
  52. GRB 130925A: Swift/UVOT Upper Limits
  53. GRB 130925A: optical upper limit
  54. GRB 130925A: Continued RATIR Optical and NIR Observations
  55. GRB 130925A: RATIR Optical and NIR Observations
  56. GRB 130925A Swift-BAT refined analysis
  57. GRB 130925A: Swift-XRT refined Analysis
  58. GRB 130925A: TAROT La Silla observatory optical observations
  59. GRB 130925A: Enhanced Swift-XRT position
  60. GRB 130925A: VLT/UVES observations
  61. GRB 130925A: GROND afterglow candidate
  62. GRB 130925A: Swift detection of a burst
  63. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  64. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  65. GRB 130903A: optical observations
  66. GRB 130907A: Maidanak optical observations
  67. GRB 130912A: AAO optical upper limit
  68. Fermi Trigger 401326696: MASTER prompt optical observations
  69. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  70. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  71. GRB 130919A, Swift-BAT refined analysis
  72. GRB 130913A detected in ground analysis of Swift-BAT data
  73. GRB 130912A: Swift/UVOT Upper Limits
  74. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  75. GRB 130912A: 5.8 GHz VLA upper limit
  76. GRB 130912A: RATIR Optical and NIR Upper Limits
  77. GRB 130907A: Continued RATIR Optical and NIR Observations
  78. GRB 130912A: P60 Observations
  79. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  80. GRB 130912A: Enhanced Swift-XRT position
  81. GRB 130912A: REM optical/NIR upper limits
  82. GRB 130912A: GROND observations
  83. GRB 130912A: Swift detection of a short burst
  84. GRB 130907A: AMI radio detection
  85. GRB 130907A: Continued RATIR Optical and NIR Observations
  86. GRB 130907A: RATIR Optical and NIR Observations
  87. GRB 130828A: Further Swift XRT observations
  88. GRB 130907A: Further Swift-BAT refined analysis
  89. GRB 130907A: Enhanced Swift-XRT position
  90. GRB 130907A: Swift/UVOT Detection
  91. GRB 130907A: Early Tautenburg detections, red afterglow
  92. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  93. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  94. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  95. GRB 130831A: optical observation in Chuguev AO
  96. GRB 130831A: optical observation in Gissar AO
  97. GRB 130907A: Swift detection of a burst with an optical counterpart
  98. Swift follow-up results of the possible weak INTEGRAL GRB
  99. GRB 130903A: Swift/UVOT Upper Limits
  100. Swift follow-up of an INTEGRAL possible weak GRB

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